Communication system, key managing/distributing server, terminal apparatus, and data communication method used therefor, and program

a technology of communication system and terminal, which is applied in the field of communication system and data communication method used therefor, can solve the problems of unauthorized use, inability to realize p2p communication by short-range wireless communication, and inability to process in a small-scale terminal such as a portable terminal apparatus, so as to reduce the load of network and server
US20100223463A1Inactive Publication Date: 2010-09-02NEC CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NEC CORP
Publication Date
2010-09-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

To provide a mobile communication system that can prevent unauthorized use of an encryption key otherwise caused by loss thereof and that can securely perform a direct communication between terminals using the encryption key. A portable terminal apparatus 1-1 transmits a P2P communication trigger to a portable terminal apparatus 1-n through a key managing / distributing server 3. In response to the transmission / reception of the trigger, the portable terminal apparatuses 1-1 and 1-n establish IPsec data sessions with the key managing / distributing server 3 through a SIP server 2 and a secret key is distributed per communication to the portable terminal apparatuses 1-1 and 1-n from the key managing / distributing server 3. The portable terminal apparatuses 1-1 and 1-n establish an IPsec data session therebetween using the secret key, thereby performing a P2P communication. The key managing / distributing server 3 performs key delivery control for switching to the session and establishing the session, with respect to the portable terminal apparatuses 1-1 and 1-n.
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Description

TECHNICAL FIELD

[0001] This invention relates to a communication system, a key managing / distributing server, a terminal apparatus, a data communication method used therefor, and a program thereof and, in particular, relates to a method of performing a data communication by securely obtaining a dynamically generated encryption key.BACKGROUND ART

[0002] In recent years, for portable terminal apparatuses such as portable telephones, following the increasing multifunctionality thereof, a method has been proposed that directly connects between portable terminal apparatuses by short-range wireless communication or the like to perform a data communication therebetween, in addition to wireless communication through a wireless base station. Such a conventional technique is described, for example, in Unexamined Patent Publication No. 2003-087267.

[0003] In that event, in the case of connecting the portable terminals by P2P (Peer to Peer: direct communication between terminals) communication (includ...

Claims

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